Possibly a ground, but I keep thinking back about an issue on my C1500 where a wire in one of the connectors at the ecm had worked itself loose and became intermittent. The truck ran terrible. This circuit went to one of the fuel injectors on the tbi. It was just dumb luck that I found it. I tugged on wires all over that truck. Replaced the ecm a couple times. Checked wires with a dvm. Finally tugged on the right wire and it reared its ugly head. Reterminated the particular contact and issue resolved.
Makes me wonder, if it’s consistent it’s usually ignition related. But when it randomly misses it might suggest fuel related.
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